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Linux May Be the Best Way to Avoid the AI Nightmare
(www.lifewire.com)
This is a most excellent place for technology news and articles.
They're available on the open market but you have to buy them as integrated systems since no especially available motherboard has a socket for them, don't even think there's a standard for a socket. They come soldered to the board which isn't the best because when a better version comes out you basically have to throw everything away and start again.
But in a few years I suspect we'll have proper socketed versions.